Unitary safety device for motion picture projecting machines



Sept. l, 1931.

UNITARY SAFE'IY DEVICE FOR MOTION PIGTURE PROJEGTING Filed June 18, 1928INV TOR: fiomas .AZZcn wmvnssra:

TTRNEY T. T. ALLEN Sept. 1, 1931.

UNITARY SAFETY DEVICE F'OR MOTION PICTURE PIOJECTING MACHINES Filed June18 1928 3 Sheets-Sheet 3 screw 37 secures the swivel block to thesha-ft.

A bent rod is also securecl in the swivel block und extendslongitudinally through thc same by the portion 38 anal has a downwarcllyextending portion 39 und a bent anal 41 While its poltion 88, afterpassing through the swivel block, is bent ovcr into a slot 42 und holdtherein by a washer 43 sccnred by a screw 44.

This particular kind cf switch actnating device, While clifferingmaterially in cletail from what is shown therein, is incorpomted in acopending application filed by Joseph E. Cohen, on July 9th, 1927,Serial N0. 204:, 455, issued as Put. N0. 1,763,922 011 June 17, 1930.

At the lower left hancl co rner of the monnting or bracket 11 the1e isprovided a rearwarclly ext-encling a=rcuate Wall. 46 which tcrminates ina right angular portion 47 having alug 48 for receiving thc shaft 49 ofa centrifugal dowser switch 51. T.his ccntrifugal dowser switch is shownand clcscribecl in a co-pencling application of Thomas T. Allen,applicant herein, ancl John Francis Adams, filecl Dece1nber 13th, 1927,Scrial N0. 239,622, issued as Put. N0. 1,809,816 on Junc 16,1931.

In the instantapplication, the centrifugal 1ncchanism of this switch isprovicled with a pinion 52 form0d preferably of graphite imprcgnatedbakelioe 01 some other noiseless matcrin-l und this pinion is meshed byan idlc gear 53 which is 1nountecl 0n a shaft 54 which extcnds throughthe lug 56 on the rear 0f the mounting and provicled at each end of theszune with necessary recluced screw portions 5T. Euch of ehe screwportions are provided with washers. 57 and nuts 58 so that thc shaft maybe properly positioned in the mounting to provide a. bcaring limit forthe gcar without binding the szune.

At a convenient place 011 the brackct there is provicled a ts1n1inal 01splice box 59 where the necessn;ry clectrical connections are madc undthe s2une insulatecl in the proper manner.

Leacling fr0n1 thc centrifugal switch 51 is a cable 61 which is securedin place 0n the mounting by a clip 62. The terminal box is provided witha cover 63.

The switch 38, ter1ninal box 59 und centrifugal switch 61 are allenclosed within thc mechanism housing when the side cover (not shown) isplacscl there0n and thc id1e gear 53 1ncshes with one of the gcars ofthe fihn feccling mechanism so that whcn saicl mechanism is operatecl,the switch 53 Will operate to centrifugally open it-s contact so thatthe motor circuit may be used f0r operating the shutter mechanism.

The uses of the several switches describcd herein zu-e in euch casefully explained in the application referred to hereinbefore inconnection With the same.

The mounting provicles a. unitary structnre which ca1ries thecentrifugal dowser switch, fihn sWitch an(l curvcd loop platc, and theentire mechanism nmy be qnickly und conveniently incorpomted in zu Motiograph wiuhout thc removal 01 substitution of parts.

Of c0u1sc the mounting illustratc l nmy be 1noclified in various wayswithont lepa1ting f1'0n1 ehe invention herein sct forth und hereafterclai1ned.

Thc invention is hereby clui1ned as follows:

A unitary xnounting for cooperativo elen1ents f01 actuating a safetydevice for a 1notion picture projecting 1nachino, comprising a esstmetul me1nber spaced fro1n und Sccnrcd to the fra1ning platc, a shzutsupportod at onc end in said membcr fo1 mounting a fihn switch thcreon,a hoocl hs-ving u bearing f01" mounting the rotatable art cf centrifugalswitch, und 1neans fo1 mounting an icllc gcar 'E01 mcshing With s:1i lrotal; able parc anal an operative gczu. 0'l" the fihn fceclingmcchanism.

In testimony whereof I hzwe signcd n1y nfx-1ne to this specification.

THOMAS T1VADDEL ALLEN.

